To contact support when you're facing difficulties signing in to the Zoho Mail Android app:
Tap Sign In.
Tap the More Options icon in the top-right corner of the Sign In page.
Tap Feedback, then choose the email client you want to use to send the feedback.
Enter the Zoho email ID for which you're facing the issue.
Describe the issue you're facing.
Tap the Send icon at the top-right corner of the screen.
Once ready, tap the Send icon to submit your feedback email to the support team.