Hi, There
As I known, if your Microsoft account is still signed in on servers, don’t reset the password — it may break activations.
To recover your Windows Server 2019, CAL, and RDS keys, go to the Microsoft Licensing Service Center > Contact Us > Licensing Support. Explain that you’ve lost account access but still have proof (invoices, serials, screenshots). They can verify and reissue or transfer your licenses.
For RDS CALs, open Remote Desktop Licensing Manager > Help > Manage Licenses > Telephone activation and call the Microsoft Clearinghouse for reactivation.
If it’s a personal Microsoft account, try the account recovery form.