My sent mail are not getting open rate for continuous 2 mails. please solve this issue or let me know what can I do from my end.
You can’t force open rates to be read by email clients as it is possible with privacy settings that nothing is being recorded which could impact your data. Is there a CTA in your email? If so, are you seeing traffic from the CTA? What is the source of the list? Is this a new list or an existing list that was previously seeing good open rates?
If this is an error in Hubspot your best bet would be to open a support ticket as these are community forums and we are users like you that do not have access to look into potential technical issues as Hubspot was.