Hi @Bigshow
Pls refer the below sample for sending the summary of emails received to shared mailbox:
1. Firstly, we will set the recurrence for sending the daily email. Here I have set up trigger time as 11:59 PM:

2. Next, add "Get emails" action to get all the emails which are received today i.e. past 24 hours. Using search parameter, we are filtering the emails which are received today and in the 'Original Mailbox Address' put the shared mailbox address:

Search query used here:
received:@{formatDateTime(utcNow(),'yyyy-MM-dd')}
3. Now, add "Create HTML table" action to create html table. Select "Custom" option from 'Columns' drop down list to add the columns required for sharing summary in the html table. For getting the value of each header, we need to write an expression. Expression needs to be written in the expression box as shown below:

Expression used for subject:
Expression used for sender:
item()?['from']
Expression used for recipients:
item()?['toRecipients']
4. Finally, add the output of create html table action in email body and send it to the required recipient:
I hope this flow will give you some idea to start with.
If this helps & solves your problem, please remember to give a 👍 and accept my solution as it will help others in the future.
Thanks