Error on Saving a GPT with OAUTH

Try to create a GPT but every time I try to save with OAuth setup it errors

Error saving draft
Something went wrong. If this issue persists please contact us through our help center at help.openai.com.

Not sure how I report at help.openai.com

Had the same issue. Checking network requests in browser inspector helped. In my case the issue was non matching authorization url, token url and api base url domains.