I reset my password, the reset did not “take”, I reset it just now a second time and that is now working.
On a current generation iPad running iPadOS, there is a system setting (cannot locate it at the moment) which analyzes known, published, hacked databases that are now in the published/public realm. My system alerted me that my sign-in credentials on sprinter-source.com (username, password) had been part of a hacked data set. So, I changed my password.
It is possible that all the Sprinter-source.com forum participants have compromised credentials… so I posted here.