To file a 90-day report in Thailand, you do need a TM30 if your current address is different from the one used for your last yearly extension. However, if your address is the same as the one provided during your yearly extension, a TM30 is not necessary. Furthermore, for online submissions, a TM30 is not required, but it is needed for in-person reporting.
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.