Data Transfer fails with no explizit error message

Hi I just started working with strapi and tried to deploy my local app now.

For any reasons a simple database dump didn´t worked and all relations are gone.
I´m now trying to migrate via the data transfer feature but got a generic error message.

error: [FATAL] Failed to initialize the connection: Unexpected server response 400

I created a transfer token with “Full Access” and run this command:

npm run strapi transfer – --to --to-token mytoken-1 --force

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We fixed the issue with updating the database manually with a sql dump.