It looks like there could be a permission issue with the Xconnect certificate.

Try out the below steps:

1. Window + R to open run window and type mmc.
2. Go to File menu and click on Add/Remove Snap-in...
3. Select certificates and click on Add button and select Coumputer account then click Next > Finish > Ok button.
4. Go to Personal > Certificate and right-click your .xconnect certificate.
5. Go to All Tasks > Manage Private Keys.
6. If LOCAL SERVICE and NETWORK SERVICE are not listed under the Group or user names then add them.

Now try to restart your IIS.

Hope it helps!

It looks like there could be a permission issue with the Xconnect certificate.

Try out the below steps:

1. Window + R to open run window and type mmc.
2. Go to File menu and click on Add/Remove Snap-in...
3. Select certificates and click on Add button and select Computer account then click Next > Finish > Ok button.
4. Go to Personal > Certificate and right-click your .xconnect certificate.
5. Go to All Tasks > Manage Private Keys.
6. If LOCAL SERVICE and NETWORK SERVICE are not listed under the Group or user names then add them.

Now try to restart your IIS.

Hope it helps!