The status "InvalidTel" and automatic notifications sent by email describing "The MSISDN number XXXXX is invalid and the number has been rejected." indicates an issue with the destination address for a recently submitted message. In most cases this is caused by the destination address missing the country code.
The format of the destination address is the country code including the mobile phone number without any spaces, the plus character or any other non-numerical characters. For example the format for this phone number: +47 123 45 678 would be 4712345678.