This is to be solved by Zoho.
Just to update all users and our clients, at this point favicon does not work.
This option is only available with the paid PRO plan and above.
We have already contacted Z Support and they are working on it.
TO ZOHO:
Please post update here once fixed.
Best Regards,
Peter
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Total Facility Solutions Ltd
United Kingdom
ZOHO Alliance Partner
www.total-fs.co.uk