Learn Icelandic: Eigum við að nota rafræn skilríki?

It combines raf, a root meaning electricity, with the suffix -rænn, which means pertaining to or of the nature of. Together, rafrænn means of an electrical nature, or simply electronic.

Why is the adjective rafræn without its usual double -n ending?

Adjectives must agree with the noun they modify. Because the verb nota takes an object in the accusative case, and skilríki is a neuter plural noun, the adjective must take the accusative neuter plural form, which is rafræn.

Why does the translation say ID in the singular when skilríki is plural?

In Icelandic, the word for ID or credentials, skilríki, is almost exclusively used as a plural noun. Even when referring to a singular English concept like an electronic ID, you still use the plural form in Icelandic.

Doesn't eiga usually mean to own? Why does it translate to should here?

On its own, the verb eiga does mean to own or possess. However, the set phrase eiga að followed by a verb means to be supposed to or ought to. Therefore, Eigum við að nota...? is the standard way to ask Should we use...?