You can get to the right permission scheme via the project header -> permissions or by going into the administration section and finding the list of schemes and clicking on the one your project is associated with.
You can run the permission helper in order to understand why it's not possible to assign tickets to this particular user. Please follow the documentation below:
This community is celebrating its one-year anniversary and Atlassian co-founder Mike Cannon-Brookes has all the feels.Read more
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