If you had too many failed attempts in a short time period, your account could have been blocked as a security measure, which the error message you shared suggests. Visit Upwork.com and log in from there to check if you can unblock your account and access it on your mobile device.
If this doesn't help, please follow up on this thread and I'll assist you further.
Could you please send a screenshot of the error message you are receiving? There should be a
Trace ID in the message that will help us identify the issue.
Sorry about the inconvenience.
We'll have someone reach out to you regarding this issue so that we can investigate further. Please make sure to save a screen grab of the error on your phone so that you can share it via email when the support team reaches out to you.
You can find advise on how to Troubleshoot the Desktop App here. If you still experience problems, report the issue so we can help you. Here’s how: