I hope that would help to solve the issue.
0; 1 Initialise - 04/05/2025 15:13:50
79; 2 GetNetworkAddresses - #MullvadVPN_IP,dns=True,name=Mullvad,speed=100000000000
80; 3 GetNetworkAddresses - #Tailscale_IP,dns=False,name=Tailscale,speed=100000000000
80; 4 GetNetworkAddresses - #WiFi_IP,dns=True,name=WiFi,speed=866700000
80; 5 GetNetworkAddresses - 127.0.0.1,dns=False,name=Loopback Pseudo-Interface 1,speed=1073741824
80; 6 GetNetworkAddresses - http://#WiFi_IP:49382
127; 7 ProcessMessage 192.168.0.10 - device 'uuid:5b46aea3-c50d-e7dd-0303-4a80458d7ea5:KF 1500 - Foobar Renderer',valid=True
242; 8 ProcessMessage 192.168.0.145 - device 'uuid:548a2cb5-2925-37ea-1818-b827eb6e1009:Volumio-UPnP/AV',valid=True
0; 1 Initialise - 04/05/2025 15:30:51
68; 2 GetNetworkAddresses - #MullvadVPN_IP,dns=True,name=Mullvad,speed=100000000000
68; 3 GetNetworkAddresses - #Tailscale_IP,dns=False,name=Tailscale,speed=100000000000
68; 4 GetNetworkAddresses - #WiFi_IP,dns=True,name=WiFi,speed=866700000
68; 5 GetNetworkAddresses - 127.0.0.1,dns=False,name=Loopback Pseudo-Interface 1,speed=1073741824
68; 6 GetNetworkAddresses - http://#WiFi_IP:49382
108; 7 ProcessMessage 192.168.0.10 - device 'uuid:5b46aea3-c50d-e7dd-0303-4a80458d7ea5:KF 1500 - Foobar Renderer',valid=True
201; 8 ProcessMessage 192.168.0.145 - device 'uuid:548a2cb5-2925-37ea-1818-b827eb6e1009:Volumio-UPnP/AV',valid=True
882738; 9 Profile - Generic Device, useragent=|
882739; 10 Profile - Generic Device, useragent=|
882842; 11 Activate - Volumio-UPnP/AV:http-get:*:application/flac:*,http-get:*:application/x-flac:*,http-get:*:application/ogg:*,http-get:*:audio/flac:*,http-get:*:audio/x-flac:*,http-get:*:audio/aac:*,http-get:*:audio/x-aiff:*,http-get:*:audio/aif:*,http-get:*:audio/aiff:*,http-get:*:audio/dff:*,http-get:*:audio/x-dff:*,http-get:*:audio/dsd:*,http-get:*:audio/x-dsd:*,http-get:*:audio/dsf:*,http-get:*:audio/x-dsf:*,http-get:*:audio/m4a:*,http-get:*:audio/x-m4a:*,http-get:*:audio/matroska:*,http-get:*:audio/x-matroska:*,http-get:*:audio/mp1:*,http-get:*:audio/mp3:*,http-get:*:audio/mp4:*,http-get:*:audio/mpeg:*,http-get:*:audio/x-mpeg:*,http-get:*:audio/ogg:*,http-get:*:audio/vorbis:*,http-get:*:audio/x-ape:*,http-get:*:audio/ape:*,http-get:*:audio/x-monkeys-audio:*,http-get:*:audio/wav:*,http-get:*:audio/x-wav:*,http-get:*:audio/wave:*,http-get:*:audio/x-ms-wma:*,http-get:*:audio/x-ogg:*,http-get:*:audio/x-scpls:*,http-get:*:audio/x-vorbis+ogg:*,http-get:*:audio/x-vorbis:*,http-get:*:audio/x-wavpack:*,http-get:*:video/mp4:*
891081; 12 Play - Input - \\192.168.0.10\nas\Media\Music\Chico Buarque\1971 - Construção\04. Construção.flac Output - (http://#WiFi_IP:49382/files/0E07762278EF1120p.flac)
892026; 13 Profile - Generic Device, useragent=Music Player Daemon 0.23.15
892045; 14 GetFile[1] #WiFi_IP - GET \\192.168.0.10\nas\Media\Music\Chico Buarque\1971 - Construção\04. Construção.flac to 192.168.0.145
892051; 15 Profile - Generic Device, useragent=Music Player Daemon 0.23.15
896999; 16 GetFile[1] - exit=0, playtime=4946
1194221; 17 PostSoapRequest - 500,send=POST /uuid-548a2cb5-2925-37ea-1818-b827eb6e1009/ctl-urn-schemas-upnp-org-service-AVTransport-1 HTTP/1.1
Host: 192.168.0.145:49152
User-Agent: MusicBee UPnP Plugin
Content-Type: text/xml; charset="utf-8"
SOAPAction: "urn:schemas-upnp-org:service:AVTransport:1#Pause"
Content-Length: 290
<?xml version="1.0" encoding="UTF-8"?><s:Envelope s:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" xmlns:s="http://schemas.xmlsoap.org/soap/envelope/"><s:Body><u:Pause xmlns:u="urn:schemas-upnp-org:service:AVTransport:1"><InstanceID>0</InstanceID></u:Pause></s:Body></s:Envelope>
1194222; 18 SoapRequest:Pause:urn:schemas-upnp-org:service:AVTransport:1:InstanceID=0 - <?xml version="1.0"?>
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/" s:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
<s:Body>
<s:Fault>
<faultcode>s:Client</faultcode>
<faultstring>UPnPError</faultstring>
<detail>
<UPnPError xmlns="urn:schemas-upnp-org:control-1-0">
<errorCode>501</errorCode>
<errorDescription>Action Failed</errorDescription>
</UPnPError>
</detail>
</s:Fault>
</s:Body>
</s:Envelope>
1194222; 19 Pause - status=500