Plex music library scan missing subfolder, media server URL for partial scans not working

Server Version#: Version 1.43.1.10611
Player Version#: 4.159.0

While trying to search for an album, I discovered that a single subfolder cannot be scanned in my music library. Its permissions, naming structure, and file formats all check out. I followed the guide for Plex Media Server URL Commands and get a blank page while the following appears in my console:

Request: [50.148.31.26:48588 (WAN)] GET /library/sections (5 live) #5397e TLS GZIP Signed-in Token ([USERNAME])
Completed: [50.148.31.26:48588] 200 GET /library/sections (5 live) #5397e TLS GZIP 0ms 1074 bytes (pipelined: 2)
Request: [50.148.31.26:48588 (WAN)] GET /media/providers (5 live) #55d6a TLS GZIP Signed-in Token ([USERNAME])
Request: [100.115.41.106:46148 (Subnet)] GET /media/providers (5 live) #534d6 GZIP Signed-in Token ([USERNAME])
Completed: [100.115.41.106:46148] 200 GET /media/providers (5 live) #534d6 GZIP 29ms 6125 bytes (pipelined: 2)
Completed: [50.148.31.26:48588] 200 GET /media/providers (5 live) #55d6a TLS GZIP 29ms 6258 bytes (pipelined: 3)

The URL command is formatted: http://[PMS_TAILSCALE_IP_ADDRESS]:32400/library/sections/2/refresh?path=/Volume2/NAS/Music/Electronic/Chillout/PITP_Label&X-Plex-Token=MyTokenGoesHere

and I have checked with http://[PMS_IP_Address]:32400/library/sections?X-Plex-Token=YourTokenGoesHere that the section ID and path are accurate. As you can see, I am accessing remotely with Tailscale, but I don’t see how that would be an issue.