For those who wish to complete their 90 day online (Other than their initial (1st) 90 day report that has to be in person) then here is the link [members only]
From Signing up to receiving and printing off the e-mail (approved) took all of 8min 20sec.
Good luck
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TLDR : Answer Summary
This post provides information on how to complete the 90-day report for Thailand online, detailing the process from signing up to receiving email confirmation. It also includes a comment mentioning the alternative option of filing the report by post.
90 DAY REPORTING RESOURCES / SERVICES
Use the trusted Thailand 90 Day Reporting Service to get your in-person report done and mailed to you for as low as 375 THB (even if the online system doesn't work for you).
For immediate assistance, contact Thai Visa Centre directly via LINE at @ThaiVisaCentre or Email them.