QB Issue Resolution:

Easiest way would be to add them as a Team Member to your practice. You can restrict them to just your practice or grant them access to some or all of your client’s without having to add them to each in turn

 

https://community.intuit.com/articles/1768864-how-to-manage-users-in-quickbooks-online-accountant

Resolution for Issue 'Can I share my records with a Tax Advisor? I use QB Accountant and, for my clients, I Manage Users-add Accounting Firm. How do I add a Tax Advisor to My Practice?' available: Yes (Solved).
Source: Intuit Community forum.

Can I share my records with a Tax Advisor? I use QB Accountant and, for my clients, I Manage Users-add Accounting Firm. How do I add a Tax Advisor to My Practice?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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