Upgrade to V20 failed - Invalid backup file (LicensePhone)

[IT 24-7]

Hi,

I just tried to update my V18 on prem installation to V20.

After uploading my backup ZIP it gave me this error:


So I had to restore the V18 phone system.
Please advise how I can fix this error.
Where I need to adjust phone numbers to have them match?

Thanks!

 

[Alphabetic]

Check that the phone number in the license details from mgmt console match what is under customer.3cx.com