The issue of QuickBooks multi-user error: network diagnostic failed is a common one. It has numerous causes, and the same can be said about its solutions as well. You can read them in the given post as we have mentioned all the aspects of the error briefly there. On a different note, if you need external support on the same, call on (855)-526-5749.
The error also occurs if multi-user mode is not installed properly by the user, which obviously in return creates the issues and these issues sometimes are difficult to resolve or troubleshoot.
We assure you that Usingpos QuickBooks guide helpdesk will provide you the best assistance.
Which can create roadblocks in smooth functioning.
One of the major errors that people encounter is QuickBooks Multi-user mode is not working.