التنبيه الأمني في الهاتف بعد محاولة تسجيل الدخول.

Not really. In normal grammar, this is best understood as a noun phrase or a headline-style fragment, which is very common in alerts, menus, and interface text.

Literally, it is something like:

• the security alert
• in/on the phone
• after an attempt to log in

Arabic often leaves out words like appeared, was shown, or came up when the context is obvious.

A fuller sentence could be:

• ظهر التنبيه الأمني في الهاتف بعد محاولة تسجيل الدخول
  The security alert appeared on the phone after the login attempt.

Because الأمني is an adjective describing التنبيه, and in Arabic adjectives normally match the noun they describe.

So if the noun is:

• definite → the adjective is also definite
• masculine → the adjective is also masculine
• singular → the adjective is also singular

Here:

• التنبيه = the alert
• الأمني = the security-related

So together:

• التنبيه الأمني = the security alert

This is different from an iḍāfa construction. It is not alert of security; it is alert + security-related adjective.

Because الأمني is an adjectival form, while الأمن is a noun.

• الأمن = security
• أمني = security-related / security-

So:

• التنبيه الأمني = the security alert
• but التنبيه الأمن would be incorrect here

This pattern is common in Arabic:

• سياسة → سياسي
• اقتصاد → اقتصادي
• أمن → أمني

It is an adjective phrase, not an iḍāfa.

Compare:

• التنبيه الأمني = the security alert
  Here الأمني is an adjective.

But an iḍāfa would look more like:

• تنبيه الأمن = the alert of the security [department/system]
  This would mean something different and would sound less natural for the intended meaning.

A quick clue:

• In an iḍāfa, the first noun usually does not take الـ unless the whole phrase structure requires it in another way.
• In a noun + adjective phrase, both parts are often definite if the noun is definite.

Literally, في الهاتف means in the phone.

In English, we often say on the phone for screens, apps, and notifications. Arabic often uses في in places where English uses in or on, depending on context.

So في الهاتف can naturally refer to something appearing or existing on the phone / in the phone.

You may also see slightly different phrasing depending on context, such as:

• على الهاتف = on the phone
• في الهاتف = in the phone / on the phone

Both can appear, but في الهاتف is understandable and natural in many interface-like contexts.

Because محاولة here is being used in a general, indefinite sense:

• after an attempt to log in
• not necessarily after the specific attempt

So:

• بعد محاولة تسجيل الدخول = after an attempt to log in

If you said:

• بعد المحاولة = after the attempt

that would sound more like a specific, already known attempt.

Arabic often uses an indefinite noun after بعد when introducing an event in a general way.

It is basically a noun phrase meaning:

• an attempt of logging in
• more naturally in English: an attempt to log in

Breakdown:

• محاولة = attempt
• تسجيل = registering / recording / logging
• الدخول = the entering / access / login

In tech Arabic, تسجيل الدخول is the standard expression for logging in / sign-in.

So:

• محاولة تسجيل الدخول = a login attempt

This is a very common Arabic pattern:

• noun + verbal noun phrase

For example:

• محاولة الفهم = an attempt to understand
• بدء التشغيل = starting operation / startup

Historically and literally, yes, the words come from meanings like:

• تسجيل = registering / recording
• الدخول = entry / entering

But as a fixed modern expression in technology, تسجيل الدخول means:

• log in
• sign in

Similarly:

• تسجيل الخروج = log out / sign out

So this is one of those cases where the literal word-for-word meaning is less important than the established expression.

Because تسجيل الدخول has become a set phrase in Modern Standard Arabic for login / logging in.

The definite article here is part of the standard expression:

• تسجيل الدخول = logging in / login
• تسجيل الخروج = logging out / logout

Arabic often uses the definite article in verbal-noun expressions where English does not.

So it is best to learn تسجيل الدخول as one chunk.

A careful fully-voweled reading would be approximately:

• التنبيهُ الأمنيُّ في الهاتفِ بعدَ محاولةِ تسجيلِ الدخولِ

Very roughly in transliteration:

• at-tanbīhu l-amniyyu fī l-hātifi baʿda muḥāwalati tasjīli d-dukhūli

A few useful notes:

• التنبيهُ is nominative if this phrase is treated as the main topic/item.
• الأمنيُّ matches it.
• في الهاتفِ has genitive after في.
• بعدَ causes the next noun to be genitive in an iḍāfa-like structure: بعدَ محاولةِ...
• تسجيلِ الدخولِ also shows the genitive relationship.

In everyday printed Arabic, especially in UI text, these endings are usually not written.

Yes. Arabic word order is fairly flexible, especially with attached prepositional phrases like في الهاتف and time-related phrases like بعد محاولة تسجيل الدخول.

This version is natural:

• التنبيه الأمني في الهاتف بعد محاولة تسجيل الدخول

But you could also see things like:

• بعد محاولة تسجيل الدخول، ظهر التنبيه الأمني في الهاتف
• ظهر في الهاتف التنبيه الأمني بعد محاولة تسجيل الدخول

The original order sounds especially natural for a label, caption, or notification text rather than a full narrative sentence.