IR blaster is needed to control TV from your phone. Samsung M30s doesn't have IR blaster. So probably you can't use that app to control your TV from this phone, I guess.
We would suggest you to follow the mentioned steps to resolve the issue:
1) Settings > connections > mobile network > Access Point Names > tap on three dots > Reset APN as default. (If you are using prepaid SIM).
2) Check via another SIM card in the device.
3) Reset network settings (Settings > General Management > Reset > Reset network settings).
Note: Kindly once coordinate with the network service provider.
For further assistance, register your concern in Samsung Members Application (Open Samsung Members Application > click on “+“icon > send feedback > error report/ask questions).
Kindly confirm us what issue you are facing while you are connecting with TV. Share the screenshot also in order to assist you accordingly.
Team Samsung Members