I enabled trace logging for this plugin and I do see this error in the logs: /rest/api/2/myself [c.w.j.tokens.filters.TokenFilter] Invalid token for [MZuba(JIRAUSER10108)]. It's ok because it might be a password.
I verified that the token I’m using verifies against the crypt-based hash in the database, so the token is indeed valid.
v1.1.6 Fixed
#17. API Tokens do not work when using Okta SSO. Case sensitivity issue→ <<cset de6d4c1d2761>>