You would need to contact your Carrier for assistance but you can try to reset your network settings to see if that helps.
Phone Settings
General Management
Reset
Reset Mobile Network settings
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Are you using Samsung Messages? You will have to switch to Google Messages, as Samsung Messages only supports limited RCS features on specific phone models with specific carriers. So you would be limited to SMS only if you do not have one of the phones or carriers where RCS works. No A series phone has the version of Samsung messages with RCS. If you still have a legacy version, it is likely an outdated, unsupported version of RCS.
