Conference Room Call Repeats "Invalid PIN" message 3x and ends

Anytime I require a PIN on a conference room call, I get the message “That PIN is invalid for this conference” three times in a row and the call ends. This happens regardless of whether any digits are dialed. I can create conference rooms that work without PINs without issue. Any suggestions?

This appears to be a bug of some sort as the log shows

[2026-03-26 11:25:47] WARNING[216799][C-00000016] file.c: File enter-conf-pin-number does not exist in any format

160671[2026-03-26 11:25:47] WARNING[216799][C-00000016] file.c: Unable to open enter-conf-pin-number (format (ulaw)): No such file or directory

However, the referenced file appears in /var/lib/asterisk/sounds/en in the correct formats.