Lulu here from the Shopify Support team. Thank you for getting in touch and I'll be more than happy to help you out with your question.
Sorry to hear you are having trouble logging into your store. We have not had any other reports of this incident yet. Can you send me a screenshot of this error message you are seeing so I can take a closer look for you?
Can you please clear your cache and cookies and ensure you are using an up to date version of Google Chrome. Once you have done that, can you try logging in again for me and let me know how you get on?
Lulu | Social Care @ Shopify
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