QB Issue Resolution:

letting me know you’re experiencing this glitch when trying to activate. Some users have been running into troubles with activating through the Begin Activation window, but don’t worry, our team is on the job to find a fix. In the meantime, give our phone support team a call at 1-877-772-9158. One of our agents can help you get activated and back in business with your account. You can reach out to our Pro and Premier support team at any time. Our Enterprise support team is available Monday to Friday between 9 a.m. and 8 p.m. EST.

Resolution for Issue 'QuickBooks Desktop Pro 2019. I click “Begin Activation” then a few dialogs open / close right away and it’s back to the welcome dialog and it asks me to activate again.' available: Yes (Solved).
Source: Intuit Community forum.

QuickBooks Desktop Pro 2019. I click “Begin Activation” then a few dialogs open / close right away and it’s back to the welcome dialog and it asks me to activate again.: 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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