No longer able to connect to tenancy

Summary:

Without any warning, I am no longer able to connect to my freetier tenancy in Frankfurt, Germany.

Content (required):

When I access the OCI portal, I enter my "Could Accountname" which is accepted (an invalid one is immediately rejected).

Then I select "oracleidentitycouldservice" which takes me to the logon page.

On the "Oracle Cloud Account Sign In" page I enter my email address and password as I have done for more than a year and browser (Chrome) respondes with:

{
  "code" : "NotAuthenticated",
  "message" : "The required information to complete authentication was not provided or was incorrect."
}

Unsure what is going on, at the Cloud-Accountname" page I used the account help link to query which emails are assigned to this account and received an email saying none are assigned!