Big Sur "network accounts are unavailable" Corporate login fails post upgrade
I've upgraded to Big Sur and afterwards my corporate account is locked out. When I try to log in there's a red button in the top right that identifies "network accounts are unavailable". The Mac prompts me to set a new password but then shakes and refuses to take the new entry, not surprising as the red button indicates that my corporate authentication server is unavailable.
I contacted my IT team and they confirmed that at least one other employee is experiencing the same issues having also upgraded over the weekend.
Has anyone else had this problem and resolved?
MacBook Air 13″, macOS 11.0