There are 2 workarounds for this behavior:
Remove the old VAC installation from the VCC server.
orImport the certificate manually following the steps below:
1. Open the Veeam Backup & Replication console on the VCC server and find out what certificate is currently in use:

2. Run the
certmgr command from the cmd, find the certificate in question and export it with the private key:

3. Copy and install the exported certificate on the new VAC server. Make sure
Local Machine is selected as a Store Location:


4. Restart the Veeam Management Portal service: