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Android 11 was introduced in 2020 and security updates for it were stopped in 2023. Android is now on version 16.
It seems very unlikely that if BT say that it is not compatible and they no longer support it that they will change their mind in the future. You should however stil be able to access your MyBT using a web browser.
A lot of Apps become obsolete on certain devices over time unless they have the latest version of Android. My Sister lost her HSBC App use on her old, slow Samsung tablet and so she upgraded (horrible word) to a new tablet. I told her she could log in via their website but that sort of thing is beyond her technical level.
I too have suffered a similar fate with the YouTube App on an old Galaxy Tab running Android 8 so I just have a screen link to the website for YT.