Learn Hardcore German: Die Chefin sagt, die Genehmigung sei vorerst gültig. - The boss says the authorization is valid for now.

Because sei is Konjunktiv I (subjunctive I) of sein, the standard form for reported/indirect speech in German. It marks that the statement is attributed to someone else (the boss) and is not asserted by the narrator as a fact. Ist would be the indicative (statement of fact).

Do I need dass here? Can I write Die Chefin sagt, dass die Genehmigung vorerst gültig sei/ist?

You can include dass:

With Konjunktiv I: …, dass die Genehmigung vorerst gültig sei. (stylistically preferred in careful writing)
With indicative: …, dass die Genehmigung vorerst gültig ist. (very common in everyday German) Using sei keeps the reporting distance clear; using ist sounds more neutral/colloquial and is widely accepted.

Why is there no dass in the original sentence?

German allows an unintroduced indirect-speech clause (uneingeleiteter Nebensatz). In that case, the verb goes to the end and Konjunktiv I is used to signal reported speech: …, die Genehmigung sei vorerst gültig. It’s common in news style.

Why is the verb at the end of the second clause?

Because it’s a subordinate clause (indirect speech). In German subordinate clauses, the finite verb typically appears at the end: …, die Genehmigung … gültig sei.

When would I use wäre instead of sei?

Wäre is Konjunktiv II. Use it:

if the Konjunktiv I form would be identical to the indicative (to avoid ambiguity),
or to add extra distance/skepticism.
Here, sei (K I) is distinct from ist, so sei is the default. Wäre would subtly imply doubt or hearsay.

How do I conjugate sein in Konjunktiv I?

ich sei
du seiest
er/sie/es sei
wir seien
ihr seiet
sie/Sie seien

Is the second die (in die Genehmigung) a relative pronoun?

No. It’s just the definite article for the feminine noun Genehmigung. Both Chefin and Genehmigung are feminine, so you see die twice. In the clause die Genehmigung sei …, die Genehmigung is the subject (nominative).

Could I write it as direct speech instead?

Yes: Die Chefin sagt: Die Genehmigung ist vorerst gültig.
The colon (and often quotation marks) signals direct quotation; you then use the indicative (ist).

What exactly does vorerst mean? Any good alternatives?

Vorerst means for now, for the time being, provisionally. Near-synonyms:

vorläufig (provisional, pending final decision)
zunächst (at first, initially)
erst einmal/erstmal (colloquial: for now)
bis auf Weiteres (until further notice; often stronger/administrative)

Can I place vorerst somewhere else in the clause?

Yes. Typical and most natural: …, dass die Genehmigung vorerst gültig sei.
You can also say: …, dass vorerst die Genehmigung gültig sei (puts focus on the time limitation). In the unintroduced clause, …, die Genehmigung sei vorerst gültig is standard. Other permutations are possible but may sound marked.

Why isn’t it gültige?

Because gültig is a predicate adjective after sein. Predicate adjectives in German are not inflected: Die Genehmigung ist gültig, not gültige.

Could I use gelten instead of gültig sein?

Yes. Equivalent options:

Indicative with dass: …, dass die Genehmigung vorerst gilt.
Konjunktiv I: …, die Genehmigung gelte vorerst. or …, dass die Genehmigung vorerst gelte.
Both gelten and gültig sein are idiomatic for validity.

Is the comma before the reported clause required?

Yes. In standard German orthography, subordinate (including indirect-speech) clauses are set off by a comma: Die Chefin sagt, …

How do tenses work in indirect speech here?

Konjunktiv I shows time relative to the reporting verb:

Simultaneous: Die Chefin sagte, die Genehmigung sei vorerst gültig.
Earlier: Die Chefin sagte, die Genehmigung sei vorerst gültig gewesen.
Later: Die Chefin sagte, die Genehmigung werde vorerst gültig sein.

Is sei common in everyday conversation?

Less so. In speech, people often say …, dass … ist (indicative) or use …, dass … wäre (K II). Sei is standard in formal writing and in news reporting.

What does Chefin tell me about gender, and is capitalization important?

Chefin is specifically a female boss (male: Chef). All nouns are capitalized in German, so Chefin and Genehmigung are capitalized; adjectives/adverbs like gültig and vorerst are lowercase.