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Custom Definitions not showing in looker studio

Hello! 

Im setting up custom definitions for reporting in Looker Studio. Im setting up tags for events, that then get sent to GA4. Here im giving it a custom definition (custom dimension) and after a little while they start showing up correctly in my real time view, debug view and even in custom table reports within GA4. 

Now this is where my headache starts. None of my custom definitions are showing up in Looker Studio. I figured, wait longer. Its been 3 days for some of them, 2 for most and im not seeing any of them in Looker Studio. I was wondering if i had to manually add them like in GA4, but whatever online resource I found paid no attention to the topic as they all say it should be automatic. 

Some of the custom dimensions I added months ago to test are in the list, they no longer work as I've removed the tags so I cant see if those are functional. I dont remember having issues with those being added, but thats been months ago, so my memory might also let me down. 

I'm at my wits end with this. Thanks for the help already

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Reconnect your Ga4 data source on added data sources. It worked for me.