Based on cases I’ve handled earlier, the “Sending” status usually means the report has been pushed from Odoo but is stuck before reaching the GST portal. This can happen due to token issues, API sync delays, or incorrect return-period mapping.

I’d suggest reviewing whether:

1. The GST return period in Odoo exactly matches the period active on the GST portal.

   Even a small mismatch can stop the status update.

2. The API access token has been refreshed correctly.

   In a few past cases, the token appeared active in Odoo but wasn’t accepted by the GST system.

3. Your GSTR-1 JSON is getting acknowledged by GSTN.

   If there’s no acknowledgement, Odoo will keep showing “Sending.”

When I faced a similar issue earlier, I had it reviewed by a GST specialist, and the problem was resolved quickly after adjusting the return-period configuration and regenerating API credentials. If needed, you may want someone experienced with GST API-based filing to verify the setup end-to-end.

Hope this helps — once these checks are done, the status usually moves without issues.