No notifications on a multiple server configuration, at the 2nd account configured on the Talk app

Scenario:

Server_A and Server_B are two differents servers (VM) with a Nextcloud instance installed each. That servers share the same external public IP because they are behind an apache reverse proxy that routes every http/https connection. Each server (server_A and server_B) have different internal hostname and IP.

I don't think the problem it's in the Scenario, because at older Nextcloud Talk android app client versions the notifications worked. Not always, but normally, worked.

Steps to reproduce

Fresh intallation of android Talk app client.

1.1 - Configure account_A of server_A on Talk app.
1.2 - Send a message from other user of server_A to account_A of server_A.
1.3 -The message arrive to account_A and I receive a notification.

2.1 - Configure account_B of server_B on Talk app.
2.2 - Send a message from other user of server_B to account_B of server_B.
2.3 - The message arrive to account_B but I DON'T receive a notification.

Expected behaviour

Fresh intallation of android Talk app client.

1.1 - Configure account_A of server_A on Talk app.
1.2 - Send a message from other user of server_A to account_A of server_A.
1.3 -The message arrive to account_A and I receive a notification.

2.1 - Configure account_B of server_B on Talk app.
2.2 - Send a message from other user of server_B to account_B of server_B.
2.3 - The message arrive to account_B and I receive a notification.

Actual behaviour

The second account configured don't receive notifications.

If I delete the account_A of server_A, being after that the account_B of server_B, the unique account configured, then the account_B of server_B starts to receive correctly notifications.

If after that, I reconfigure account_A of server_A, being this the last configured account, this account don't receive notifications.

Device brand and model

S24

Android version

14

Nextcloud Talk app version

18.x.x and 18.1.0-RC2

Nextcloud server version

25.0.12

Talk version

15.0.8

Custom Signaling server configured

None

Custom TURN server configured

Yes

Custom STUN server configured

Yes

Android logs

No response

Server log

No response

Additional information

No response

Start by reproducing the two-account configuration described in the issue on Android 14 with the listed Talk versions. Compare notification behavior for the first and second accounts, collect Android and server logs, and consider the issue resolved when both configured accounts receive message notifications consistently.