Is it permissible to perform congregational prayer after re-issuing the call to prayer (adhan) for Isha prayer, following the conclusion of a lesson that began after the Maghrib adhan and continued until the first Isha adhan?

It is permissible to repeat the Adhan (call to prayer) and reiterate it, as is done for the Friday prayer. This is permitted by many scholars, while others disliked it. Sanad explicitly stated the dislike of multiple Adhans in one place because it confuses the listener. It is more preferable to avoid repeating the Adhan, contenting oneself with the first Adhan, to avoid disagreement, beware of confusion, and conform to the Sunnah. The repetition or reiteration of the Adhan does not affect the validity of the prayer.