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@gaboayala - Following on from my previous response, you may find it worthwhile, to explore Post Connections Template Types; which may be better suited for providing Magic Links to Post Contacts, who do not have user system accounts.
Once the Post Connections template has been created, it can then be referenced from within a Link Object.
Post Contacts can then access the Magic Link and update existing groups, or create new ones as required.
@gaboayala - Good to hear from you.
Within the Magic Link Plugin, we have the concept of Link Objects; which enable you to create Magic Links to address different requirements.
In your case, you will need to create a Link Object; which uses the User Group Updates Magic Link Type. Ensure the Support creating new items option is enabled.
From there, you will then need to assign the various users within your coalition, to the Link Object.
To manage the refreshing and sending out of Magic Links, see the Scheduling Documentation.
The coalition users will then be able to update any assigned groups; as well as creating new ones, from their respective Magic Links.
I hope this helps! 
@Matthew - Excellent! Glad you've now been able to resolve the issue. Talk again soon...
@Matthew - I thought I'd share some tips, to hopefully get you up and running.
Save storage settings.
On page reload, test the connection to confirm all is well. Make a note of any errors and share.
Assuming a successful connection has been established, you are now setup and ready to use the D.T Storage feature.
In addition to the attached screenshots, please explore the following links; as you may find running Minio within a Docker Container easier; regarding local testing.
@User27 nothing has changed in that plugin so I don’t know what could be causing that. I can take a look
I just pushed an update to the prayer request plugin that should add this for you. Now if your prayer request is anything but active it will show the status next to it.
Thanks for using D.T and the prayer request plugin!
@User27 that sounds like a good idea. I will see what I can do.