If you take your registration ducument to a BMW dealership they will tell you the code for free, based on the VIN number.
Or look in the Glovebox for a small white sticker, or in the Owner's manual.
But, I found this
BMW hasn't used a "radio code" since the beginning of the e38/e39/e53/e46 generation of BMWs. That technology ended with the anti-theft radios used in BMWs prior to the aforementioned e series.
The code you see appearing on your nav screen or MID (you didn't indicate which radio setup you have)...is an anomaly of the OBC's immobilizing code probably brought on by the low voltage issues you were having. There have been many threads on this topic across multiple BMW forums in that usually a simple use of "0000" or "1234" works to get past the lockout once the battery issue or low voltage issue is fixed...or initiating the emergency deactivation of the CODE found in the owner's manual.
and this confirms it is the immobilizer code
https://www.bimmerforums.com/forum/showthread.php?2270312-radio-code
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