I removed your email address, this is a public forum, and it would be easy for your details to be added to spam bots.
The problem with your account is that when you set up an email with Apple, you chose the hide my email option. I’m not sure which of the email addresses is your Apple ID, but to Trimble you are known as having a privaterelay.appleid.com address. That’s the one that has a Go subscription.
The easiest solution for now is to use the Sign in with Apple option when signing in to the SketchUp iPad app. That should then use the privaterelay.appleid.com email.
If you didn’t intend to hide your Apple ID email from Trimble, try this reddit post to see if you can do the steps they did to make it be the real email address: