Mail doesn't work after upgrade to 20.0.5

Hello everyone.
I’m currently facing a problem with “Mail” apps after upgrade to 20.0.5 (NextCloud VM Appliance downloaded from Upgrade was automatic)
After upgrade “Mail” icon is lost. It is not possible to enable it. I did a try to remove it (successful) but after “Download and Install” I’m getting “An error occured during the request. Unable to proceed”
Rest apps seems to be fine. Is it a known bug ? Are you aware of any workaround or fix ? Much appreciate for youe help. Thank you in advance.
Mail version: 1.7.2