Hi Nelson,
Have you applied the latest update - 5.90.1?
There was a patch released over the weekend that fixed issues with Export and saving files to Connect.
I tried myself with v5.90.1 and it is able to Save the project Remotely and Export items direct to a Connect folder now. The option to save the Project won't be enabled until you've selected the Server location and a Project folder - e.g. North America / Palmer Airport as an example for you.
I saw the same as you until I selected an actual project to save to as per below:

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Brendon Edge
Geospatial Support Manager
Trimble New Zealand
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Original Message:
Sent: 07-25-2023 12:53
From: Nelson Hays
Subject: TBC + Trimble Connect Workflow Story to Share?
No errors, just no ability to create or share a project folder from within TBC. Plus, CEC dealers can't resell Connect licenses.

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Nelson Hays
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Original Message:
Sent: 07-25-2023 11:35
From: Joseph Blecha
Subject: TBC + Trimble Connect Workflow Story to Share?
Hi Nelson,
What's the trouble in TBC? Are you seeing an error message?
Thanks,
Joe
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Joe Blecha
Trimble Office Software
Original Message:
Sent: 07-24-2023 18:35
From: Nelson Hays
Subject: TBC + Trimble Connect Workflow Story to Share?
Hi Joe
I like connect for collaboration, but we can't 'save file remotely' and create a folder/filespace for a new Connect project from TBC.
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Nelson Hays