No longer able to "Find related messages in this conversation" in Outlook Preview

Teresa_Cyrus 

I have configured Outlook as per your suggestions and when I am my inbox and I try to search for an e-mail I know exists in a shared mailbox it does not find it. I have tried download shared folders, conversation view the Outlook options menu to select all mailboxes and nothing is found. If I highlight the shared mailbox and search then it works. The trouble is I do not want to have to locate the e-mail in the correct thread in the shared mailbox and then search. I used to be able to search all mailboxes rom my inbox, even if I did not have a mail in my inbox that was from the person or thread I wanted to search for. 

The only way I can find e-mails in shared mailboxes is to highlight the shared mailbox and then perform the search. I have 8 shared mailboxes and regularly need to search for e-mails that could be any of them, I used to do that from my inbox now I have to go to each shared mailbox and perform the search and check the results until I find the one I want. Surely this cannot be correct, I though M365 was all about increased productivity, this has certainly decreased my productivity, increased my stress levels and made part of my job a chore rather than a simple action,

I am using latest Windows 10 and  Outlook version 2405 build 17628.20188 click to run Monthly Enterprise channel.