Welcome to Shopify Community. My name is Olivia and I work here.
I appreciate you sharing your question with our network. It's possible that the log-in credentials saved on your phone are different from the ones you are entering on your desktop computer.
When you log in, the following details must all be entered correctly:
Any wrong combination of the above, will present you with a log-in error. We can rule this out quickly by having you visit our account recovery link. Once you do a password reset, an email will be sent to you for any account you have opened with us.
Please try that and let me know if you're able to access your account on your computer.
I look forward to your reply,