Stripe Marketplace. Testing payment sent, received, and platform fee collected for multiple users

I’m creating a donation platform where a logged in user can accept & send donations.
I’m looking to test the following scenario: User 1 sends funds to User 2 & Platform collects a fee.

I set up Stripe Marketplace, enabled test mode, and entered test API keys.
I cannot make a payment to another user through the Stripe Marketplace component. In Preview, the Stripe Marketplace component is visible but not active.
I think it’s because only 1 user (me) has a Stripe ID entered into a Collection.
Is there a way to test payments between 2 users so I am able to verify that the payment is sent & is received as well a platform fee is collected?

I reviewed Stripe Marketplace + Testing documentation
And payments to multiple merchants forum post.

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