You need to create a new email account on the system, with the username you’ve chosen and the password (the password must be of minimum 10 characters, and only letters and numbers are allowed). Then enter the Roundcube and login with the credentials you’ve chosen.
I have already and I updated my password to match the critaria., but still getting an error during log-in:
And this does not explain why I am getting:
Your message to timesheet@simplesw.net couldn’t be delivered.
timesheet wasn’t found at simplesw.net. stanislav.valasekOffice 365timesheet
I checked your domain’s MX records and it looks like you’ve configured both our mail server and a mail server from Mailgun, both with the same priority. Please remove the Mailgun mail server (or set it to a higher priority) and try again.
As for logging in to webmail, I don’t know why that doesn’t work. Please try to reset the password, and make sure you don’t use any special characters in the password because those are known to cause problems.