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Try the register for a Party ID option. It was the only way I could get it working
But we filled out the application ourselves. we do not have representative
 
Okay. So I just had it working. In case, anybody comes looking for the solution to this unknown error issue:
- Please try to register on the tracker from your mobile. That will work.

It worked for me.
 
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Can’t register principal applicant to ECAS tried everything even tried to register through mobile didn’t work still showing same error: unexpected error occur try again later
 
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Reactions: he5ham
Can’t register principal applicant to ECAS tried everything even tried to register through mobile didn’t work still showing same error: unexpected error occur try again later
same for me, I'm a dev and after investigating I can see proxy server returns 502. It maybe related to special characters on our details (I do have one on my name) or something else...