Yourca says the total did not match myob?

What it does today

Connecting MYOB is not open yet, and nothing YourCA made is in your books. So none of these refusals can reach you. Serving a claim, the payment schedule, retention and the claim history all work today. Connecting opens after both accounting connections are tested end to end against a real account. Then it is one press under Company admin, Plan, then Connections. Disconnecting and choosing your company file are never closed. So anybody who has a connection can always finish it or remove it.

Connecting MYOB is not open yet, so none of these messages can reach you today. Below is what each one says when connecting opens.
If YourCA says the total or the GST did not match, it kept nothing and deleted the order it made from your MYOB. An order is not in your accounts, so nothing is left behind and your invoice numbers have no gap. Check the tax code on the job setup, then tell us.
If it says the company file has not been chosen, MYOB is signed in but cannot open anything yet. Go to Company admin, then Plan, then Connections. Give the file its user name and password.
If MYOB refused the order, the message carries MYOB's own words. The cause is almost always the customer, the account or a tax code: somebody archived or renamed it in MYOB after the job setup.
If MYOB often asks you to reconnect, that is how MYOB works, not a fault. Its sign in lasts much less time than Xero's, and a connection nobody uses for a while lapses.
When you disconnect, new claims stop going into MYOB, and payments stop arriving against your claims. Everything already in your MYOB stays there. YourCA deletes the company file password it held.

Worth knowing

Whatever goes wrong, YourCA never turns an order into an invoice and never emails anything. Nothing it creates can reach your builder unless you send it yourself.