TLS handshake error map acme: Could not determine solvers] Could not find solver for: dns-01 Could not find solver for: http-01

[schoen]

Hi @electronix001,

This is probably a result of this issue:

TLS-SNI challenges disabled for most new issuance

[…

If Mattermost has its own internal support for obtaining certificates, it may be hardcoded to use the TLS-SNI-01 method, which is no longer available. If that's so, you should let the Mattermost developers know about this problem because they'll need to switch over to one of the other methods now.