Hi neekr,
Create a new Automated Flow.
Add the "When a new email arrives" trigger (the V2 or V3 version of this is fine also). You should set the applications needing approval to arrive in the Inbox you choose, and set the Subject to match the subject that the e-mails come in from ConfigMgr as so it only acts on those e-mails.
Add the "HTML to Text" action
Add the "Body" dynamic content output from the "When a new email arrives" step to the "Content" field on the "HTML to Text" action step.
Next, Add 3 new Data Operation/Compose steps
On the first one, rename it to "Remove Linefeeds", click "Expression" and paste in
uriComponentToString(replace(uriComponent(body('Convert_Email_body_from_html_to_text')), '%0A', ''))
On the second one, rename it to "Index of dash", click "Expression" and paste in
add(int(indexOf(outputs('Remove_Linefeeds'), ' -')), -10)
On the third one, rename it to "DisplayName", click "Expression" and paste in
substring(outputs('Remove_Linefeeds'), 9,outputs('Index_of_left_parens'))
Add an Office 365 Users "Search for users (V2)" step and use "DisplayName" for its input.
Add an Office 365 Users "Get Manager (V2)" step and use the output of the Search for user (V2) step
Add an Office 365 Outlook "Forward an email (V2)" step and select the "Message Id" Dynamic Content from the original e-mail output, and the "Mail" Dynamic Content from the "Get Manager (V2) step".
Let me know if you get stuck.