[SalesForce] Customer Communities Plus Users Can’t See Reports

having trouble showing reports to users in a community. Has anyone done this successfully?

Steps I’ve followed so far:

1. Created a dev org (also tried all these steps in a trailhead playground to the same results)
2. Created a community in that dev org (used the Customer Account Portal template)
3. Created an Account and a contact looking up to that account
4. Created a custom object (Selected Allow Reporting)
5. Created a lookup to Account on that custom object
6. Created a record for that object looking up to my account created earlier
7. Created a report for that object (1 field in report – name – which user has visibility to) and saved it to a report folder shared with the community users
8. Created a Community user (Customer Community Plus license)
9. Created a Permission Set including these 4 permissions and applied to that community user: ‘Create and Customize Reports’, ‘Edit Reports’, ‘Run Reports’ and ‘Report Builder’
10. Set Access to the custom object to Public Read Only
11. Created a sharing set that allows for the custom object looking up to the Account to be seen by community users whose contact looks up to the same account
12. Added a reports tab in the community so the user can go through that to access reports in the folder shared to them

Then when I log into the community as the user, and try to access the report, I get this message
The report definition is obsolete. Your administrator has disabled all reports for the custom object, or its relationships have changed. Though I have just created everything.

When I instead create a custom report type with just the object and create a report with that (Instead of using the report type that Saleforce creates when Allow Reporting is selected on the object) I get this message You don't have sufficient privileges to perform this operation.

Any insight appreciated.