Note to all: I have heard back from Shopify Support:
"We are currently experiencing an ongoing issue that is affecting all merchants’ access to the some section in the Settings of your Shopify account. We understand the inconvenience this may cause and want to assure you that our team is actively working to resolve this matter as quickly as possible. Our dedicated developers have been notified about this issue and are diligently working to identify and rectify the underlying cause. We understand the impact this may have on your business operations, and we sincerely apologize for any disruption caused. We are committed to providing you with the best possible service, and we appreciate your patience and understanding during this time. While I don’t have an exact timeline for the resolution at this moment, I want to assure you that this is our top priority"