Outlook contacts not showing in "new" outlook

Contacts are stored and displayed differently between new Outlook and classic Outlook. To get them visible again on the laptop, use one of these supported paths:

1. If contacts are in the mailbox (cloud contacts) Since contacts appear on the mobile app, they are likely in the mailbox, not in a local .pst file. In that case, focus on fixing the new Outlook client rather than classic Outlook:

• Reset new Outlook’s local state so it re-syncs contacts from the server:
  • Close new Outlook.
  • Run the reset command described in the community answer (olk.exe --clearLocalState).
  • Start new Outlook again and sign in so it can fully resync mail, calendar, and contacts.
• After resync completes, go to People in new Outlook and check if contacts display correctly.

2. If contacts were local-only in classic Outlook If contacts were stored in a local Contacts folder in classic Outlook (for example, in a .pst file), they will not automatically appear in new Outlook. In that case:
3. Open classic Outlook.
4. Export local contacts to a .csv file:
   • File > Open & Export > Import/Export.
   • Choose Export to a file > Next.
   • Select Comma Separated Values > Next.
   • In Select folder to export from, choose the Contacts (This computer only) folder under the account.
   • Choose Browse, pick a save location and file name, then OK.
   • Confirm the path, select Next, then Finish.
   • Optionally open the .csv in Excel to verify contacts are present, then close without saving changes.
5. Import that .csv into new Outlook using the documented “Import contacts to new Outlook using a .csv file” steps.
6. If contacts were deleted from new Outlook If contacts were accidentally deleted in new Outlook, they can often be restored:

• In new Outlook, go to People.
• Open the Deleted folder.
• Select the contact(s) and choose Restore.
• If not present there, in Deleted select Recover deleted, choose the contacts, and select Restore. They will be restored to the original folder or the default Contacts folder.

If after a reset and a full resync contacts still do not show in new Outlook, verify on the web (Outlook on the web) that contacts exist in the mailbox. If they do, continue using new Outlook and avoid classic Outlook for contacts, as classic will not show cloud-only contacts without a .pst or .csv import.

References:

• Import or export contacts in Outlook using a .csv file
• Restore or recover a deleted contact in Outlook
• How do I recover my old email messages, my contacts and everything else I had in Outlook? - Microsoft Q&A
• New Outlook has stopped working, Fails when starting after 30 to 60 seconds - Microsoft Q&A