Update: I made another attempt to obtain a Certificate of Residence in Pathum Thani, this time including the required fee along with the form. I made some progress as they accepted my submission initially, but after approximately 10 minutes, another staff member approached me with inquiries. They asked whether I had previously obtained a certificate from their office, how I determined the fee, and their tone seemed somewhat suspicious. Eventually, they informed me that they had suspended this service for the past few months.
Consequently, I had to travel to Ayuthaya where the process involved a 2-hour wait (which I utilized to enjoy a delightful meal at a local boat noodle shop) and an 800 THB fee.