Edge Extension Publish/Upload API returns 500

I've just migrated from v1 to v1.1 of the Edge Extension Upload API.

Since then I'm only receiving HTTP 500 responses from the API. All credentials are correct since I've also received some 4xx before that.

The following is a curl req & res. All sensitive params are redacted. The exact same extension package gets distributed to the Chrome store. Nothing really changed in the extension package from v1 to v1.1.

> POST /v1/products/.../submissions/draft/package HTTP/1.1
> Host: api.addons.microsoftedge.microsoft.com
> User-Agent: curl/8.7.1
> Accept: */*
> Authorization: ApiKey ...
> X-ClientID: ...
> Content-Type: application/zip
> Content-Length: 345344
>
* upload completely sent off: 345344 bytes
< HTTP/1.1 500 Internal Server Error
< Content-Length: 0
< Strict-Transport-Security: max-age=31536000; includeSubDomains
< x-ms-middleware-request-id: ...
< Request-Context: appId=...
< Date: Tue, 04 Feb 2025 17:59:14 GMT