If you have 3 devices, you should have 3 BitLocker keys.
Also, in your Microsoft account there is BitLocker recovery key not BitLocker password.
If you accidentally deleted the recovery key from your Microsoft account online and want to save it again, you need to force Windows to back up the recovery key automatically. The only way to do this is to switch to a local account, and then switch back to a Microsoft account.
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Hope above information can help you.
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