Issues connecting Event Tickets to PayPal or Stripe?

I recently installed the Event Tickets Plug-in (along with Event Calendar) on a brand new WordPress site, and am having trouble getting it to connect with either Stripe or PayPal.

When I try to connect to PayPal, it gives me this error message:

{"code":"rest_missing_callback_param","message":"Missing parameter(s): hash","data":{"status":400,"params":["hash"]}}

from this URL: https://makerclasses.com/index.php?rest_route=/tribe/tickets/v1/commerce/paypal/on-boarding&merchantId=makerclasses.com?v=1.0.0-yxLxWH&merchantIdInPayPal=8HHBJWTEVG8ZJ&productIntentId=addipmt&isEmailConfirmed=true&accountStatus=BUSINESS_ACCOUNT&permissionsGranted=true&consentStatus=true&riskStatus=SUBSCRIBED_WITH_ALL_FEATURES

When I try to connect to Stripe, it gives me this error message:

{"code":"rest_no_route","message":"No route was found matching the URL and request method.","data":{"status":404}}

from this URL: https://makerclasses.com/index.php?rest_route=/tribe/tickets/v1/commerce/stripe/return?stripe=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%3D

Any suggestions on what I can do to troubleshoot this? I already have my adblocker disabled on WordPress and made sure that the site is HTTPS secure.