As part of development the Apple ID is signed into multiple devices, both iCloud & Messages. What I'm observing is after about 25 numbers are signed in (fewer devices as many have a sim + esim) Messages on non-phone devices stops working properly. The account is unable to send messages, and on macOS Messages often crashes and signs out the user.
There are also repeated alerts about devices being added the already have been added - feels like the internals have a limit and are cycling through devices in some order, adding them back dynamically.
Is there a way to increase this limit? Yes I know that Messages can be turned off or a different Apple ID can be used, but frankly that ends up being a lot of overhead for what we're trying to do thus hoping there's some limit somewhere that can be easily adjusted.