The issue is already reported to our engineers, Candidapabbs.
Our users are unable to save the GSTIN. While we're waiting for a fix, I suggest reaching out to our customer care support so you'll be added to the list of affected users. Here's how:
Click Help inside QuickBooks Online.
Select Contact Us.
Enter "Unable to save GSTIN" in the description field, then click Let's talk.
Select Start a chat.
If you have other concerns, don't hesitate to let us know. We're around to help you. Take care!
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