It may be one of the following reasons.
1. Verify Open Tracking Status:
Ensure that open tracking is enabled for your campaign before sending it to track opens in the campaign report. If open tracking was disabled for a campaign, you won't be able to see any open counts in the report.
Please read how to check and enable the campaign's open tracking.
https://tgis.freshdesk.com/a/solutions/articles/30000050095
2. Wait for enough time to reflect on the open count
It's typical for open tracking counts to take a short while to reflect in the platform after an email is opened.
While open tracking operates in real-time and should show the count as soon as someone opens your email, there might be a slight delay.
This delay can vary depending on the system's scheduled job to update and display the count, typically taking just a few minutes or seconds.
3. Is your email campaign a plain-text campaign
Open tracking depends on this tiny image pixel hence it only works in the HTML email and not in the Plain-Text campaigns, since you can not include the images in the Plain-text email campaigns.
4. The tracking image may be blocked
Open tracking may not function properly if your contacts or their email client settings are configured to not display images. Additionally, certain email inbox spam filters might block the tracking image used for open tracking.
Furthermore, some email clients disable images by default, which prevents the system from accurately tracking opens in those cases.
E.g. In the Outlook Email Client
Your contact can enable these image visibility options.
Although your click tracking will be still working even if the open tracking won't work.
5. Gmail has clipped your message.
If an email message is too large, Gmail will clip content and hide it behind a View entire message link.
When the message is clipped, it also clips the tracking code that accounts for opens.
To prevent this, reduce the message size of your email.
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