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Hello @akterdoly2015,
My name is Henry and I am happy to assist with your inquiry, and appreciate you contacting LastPass Support!
I am sorry about the issues you are having with your account. While on LastPass free, you can only use one type of device at a time (Computer or mobile devices). You can switch between these 2 type of devices up to 3 times, the message you are getting means you can no longer switch to mobile and would have to continue using computers only.
Please let me know if this helped or if further assistance is required.
Thank you,
Henry | Customer Care
