Sophos Mobile Control Error

Good Day, We have Iphone 6 devices across our organisation and are getting these errors when we try to install Sophos MDM on them. Would appreciate if we can get replies to those.

(1) We get a error saying "Activation Failed: undefined error"unable to scan QR code, please contact your system administrator for some users when they try to scan and get the sophos mobile control app on their device.

(2) Some users get the below screen when they try to scan the QR code. 


Can you please help with the resolution? Thanks.

Best Regards,