API Security Credentials?

We have been running a number of dedicated online stores for customers for years that are linked to MYOB via API.

We now cannot connect any of the online stores to MYOB as it throws a password error as per below:

https://master.merch-store.com.au/myob/connect?error=invalid_state&error_description=The+state+is+missing+or+does+not+have+enough+characters+and+is+therefore+considered+too+weak.+Request+parameter+%27state%27+must+be+at+least+be+8+characters+long+to+ensure+sufficient+entropy.&state=nb

Does anyone know if MYOB API security credentials have been changed in a recent update?

I cannot for the life of me find a MYOB telephone number in Australia to actually talk to a human about this.