Issue
When connecting to Jira, you may run into an issue where you are unable to select the Accept button as it is greyed out
Solution
Ensure that User Installed Apps are allowed in Jira settings
Go to admin.atlassian.com. Select your organization if you have more than one
Select the site's name and URL to open the Admin for that site
This step is different if you have an improved user management experience. Select Products, then select the site from the left-hand sideUnder Site settings, select Connected apps
Select Settings on the Connect Apps page
Ensure User Installed Apps are Allowed: