To resolve login difficulties on Chrome, follow these steps:
Click the Chrome menu (ellipsis) and go to Settings.
Enter the term 'Cookies' in the Search box. Scroll down and click Content Settings.
Under the Content Settings click Cookies.
Click See all cookies and site data.
Search for 'managemyspa' or ‘Zenoti’ and click the domain name.
Note: You may have a stage site too; Searching for managemyspa/Zenoti might retrieve two records. Carefully check for ZenotiAuth and remove.
Identify ZenotiAuth and Delete only this cookie.
Close and reopen your browser.
Log in to Zenoti again.
For additional information, refer to the article by Google Support: Clear, enable, and manage cookies in Chrome