Can't join Windows Insider again

I recently recovered my phone to 8.1 and upgraded again to W10M to get rid of the insider builds. But now I would like to get them back just to get the latest (and last) available build from MS. But it seems I can no longer do that. At first, I got an error 0x0 so I joined the program directly from Microsoft's website. Not I get error code 0x800bfa07. There doesn't seem to be a fix for mobile.

Anyone else getting such an issue?

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