Note 8 IMS not registered?

I have 5 lines on Metropcs. Only my wifes Note 8 IMS setti g is not registered? Feature she is missing is read reciepts (advanced messaging) carrier is no help so far. Also, i have 2 relatives on tmobile using s7 and i can see when they are typing back and read reciepts why can this phone get ims registered???

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