Looks like a fix is available in the latest software release. A different support request actually got help: https://quickbooks.intuit.com/learn-support/en-us/i...
(Edited to remove duplicate content. I was having problems posting earlier.)To further aid in gaining assistance, I've attached a screenshot of the certificate ...
Much gratitude to @bill_the_cat for determining that this is a certificate issue. I would not have figured that out. Also kudos for the lengths you went through...