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I have checked your account and seems like you tried to integrate your form when you were logged out, I have also checked the integration on my end and it is working, the same with one of your forms, I checked the integration and it seems to be working fine.
There are some forms that you've already integrated with Google Spreadsheet. Could you please try to integrate your form again?
If the issue still persists, please provide us with the link to your form, we will be glad to further check it.