I also checked this and it said no known issues.. But now I have access again, fortunately it was just a temporary issue. 

Same here. Now they have added this to the support page: There is a problem with logging in. We are aware of the problem and we're working to get it fixed. Check the Shopify status page for updates, or continue without logging in.

I have the same issue. I found their e-mail support@shopify.com and got a response:  "Thanks for contacting Shopify Support! A support ticket has not been created.From August 13, 2019, we have changed how you create a support ticket by email! As part...