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Powershell/PowerShell-collection/Office365/TweakSafeLinksPolicy.ps1

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+# Get your active SafeLinks Policy/Policies
+Get-SafeLinksPolicy | Where-Object -FilterScript {
+   $_.IsEnabled -eq $true
+} | Select-Object -ExpandProperty Identity
+
+# I use the default policy in this example
+$SafeLinksPolicyIdentity = 'Recommended safe links policy'
+
+# A list of URLs to exclude from rewriting
+$DoNotRewriteUrls = @(
+   '*.webex.com/*'
+   '*.zoom.us/*'
+   'zoom.us/*'
+   '*.teams.microsoft.com/*'
+   'zoom.com/*'
+   '*.zoom.com/*'
+   'teams.microsoft.com/*'
+)
+
+# I use the default policy in this example
+Set-SafeLinksPolicy -Identity $SafeLinksPolicyIdentity -DoNotRewriteUrls $DoNotRewriteUrls
+<#
+      Note:
+      The WhiteListedUrls and ExcludedUrls parameters are deprecated
+      Only use the DoNotRewriteUrls parameter
+#>
+
+# Remove all URLs from the SafeLinks Policy/Policies
+$DoNotRewriteUrls = @()
+Set-SafeLinksPolicy -Identity $SafeLinksPolicyIdentity -DoNotRewriteUrls $DoNotRewriteUrls
+
+# Apply my recommended settings to the policy/policies
+$paramSetSafeLinksPolicy = @{
+   Identity                 = $SafeLinksPolicyIdentity
+   DoNotTrackUserClicks     = $false
+   DoNotAllowClickThrough   = $true
+   ScanUrls                 = $true
+   EnableForInternalSenders = $true
+   DeliverMessageAfterScan  = $true
+}
+Set-SafeLinksPolicy @paramSetSafeLinksPolicy
+
+<#
+      Identity					    = The Identity parameter specifies the Safe Links policy that you want to modify
+      DoNotTrackUserClicks	    = Track user clicks related to links in email messages and Microsoft Teams
+      DoNotAllowClickThrough   = Disallow users to click through to the original URL
+      ScanUrls					    = Enable real-time scanning of links in email messages
+      EnableForInternalSenders = The policy is applied to internal and external senders
+      DeliverMessageAfterScan  = Wait until Safe Links scanning is complete before delivering the message
+#>
+
+# This is fine, no panic:
+# WARNING: The command completed successfully but no settings of 'Recommended safe links policy' have been modified.
+
+# Do this for all your Teams Room Devices that should except external invitations
+Set-CalendarProcessing -Identity '<Your Device here>' -ProcessExternalMeetingMessages $true