Hey @bg1900 really glad you found a resolution! If you don't mind sharing, posting your solution here could help others who run into the same "This connection is not private" message when accessing their self hosted Retool instance 
I'm sure this isn't the only time it's happened for someone!
And thanks for your patience -- between volunteer contributors, Retool community support engineers, and other Retool employees who chime in on the forum, we aim to get to every post but responses may vary. Some more context in our guidelines.