Be careful to all those who used the 90 days reporting online.
The approved form will print but the receipt (as printed by the immigration) might not.
Knowing that this receipt is requested when you sometimes do your Visa Extention/change type... better walk and spend a few hours at the immigration rather than being fined.
I was lucky to meet an acquaintance who helped me out but the officer said that won't happen twice.
TLDR : Answer Summary
Expat users of the online 90-day reporting system in Thailand should exercise caution, as there have been reports of issues where the system fails to print the official receipt necessary for visa extensions or changes. Although the system may show approval, the lack of a printed receipt can lead to complications and potential fines. It's advised to complete the reporting in person at the immigration office to avoid these problems.