Example instructions in the document: AT+QCOAPOPTION=6,11,“rd”,12,“42”,15,“lwm2m=1.0”,15,“ep=867725030002525;460041850403693”,15,“b=U”,15 ,“lt=86400”
When the semicolon after the IMEI number is in English format, the module will return ERROR. The test found that using other symbols can return OK . Why?

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AT+QCOAPOPTION=6,11,“rd”,12,“42”,15,“lwm2m=1.0”,15,“b=U”,15 ,“lt=86400”,15,“ep=867725030002525;12”

You can execute the EP value at the end of the instruction.

The reason is that the module program ";"Character manipulation is restricted.