The email comes into Hubspot eventually. Go into Hubspot and have a look at filtered It seems that although Xero and MYOB Accountright emails come straight in including the email to your email@example.com MYOB essentials is handled differently by hubspot.
Next after accepting the invite from filtered use this Lastpass MYOB ESSENTIALS for support as below. It is out of order in the MYOB list because the there is no - between MYOB ESSENTIALS. Look further down.
Next Step is to connect to commonledger to Come . This does cost and the Xero file costs as well. A credit card is needed. A bit of info about common ledger can be found here, however there are no instructions.