This issue was happened on a fresh installation of the latest e107git version and php v7.4

MySQL database prefix name is not editable in shared hosting service because is related to customer id.
Related to https://github.com/e107inc/e107/issues/3800
@realmontazeri Please give it a try now. Thank you.
@realmontazeri Please give it a try now. Thank you.
The issue still exists on the latest git version.
@realmontazeri Is your database name all numbers? If I understood well, @tgtje mentioned in #3800 an issue with database names that do NOT contain letters, so I have a requirement that the database name contain at least one letter.

@realmontazeri Is your database name all numbers?
Nope, it's including letters and underline.
@realmontazeri Thanks for the quick response. Maybe the underline is causing the issue. I'll take another look.
@realmontazeri I have relaxed the pattern check. Please try again, thank you.
@CaMer0n thank you, the issue has been fixed.