Hi @hamood Iqbal ,
Welcome to our forum!
In order to verify, what vesion of Outlook are you using?(File > Office Account > About Outlook)
Can the organizer of the recurring meeting also be unable to modify the date and time? Is the checkbox for all day events checked?
According to my test on Outlook, when I am an invitee of a recurring meeting, the page I open is like the picture below, there is no option button for date and time for me to modify.
Based on my search, I found an official document which metioned that you cannot change the details of meetings or events that others have invited you to.
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