E-Signature cannot add external people as recipients for requests

1. Convert to internal approval:
Download the document → send it via email to an external user for signing
Re-upload the signed document
2. Use shared links:
powershell
Set-SPOSite -Identity <SiteURL> -SharingCapability ExternalUserSharingOnly
3. Enable external user participation
powershell
Connect-SPOService -Url https://contoso-admin.sharepoint.com
Set-SPOSite <SiteURL> -ConditionalAccessPolicy AllowLimitedAccess
4. Configure signature policy
powershell
Set-SiteSignaturePolicy -Site <SiteURL> -ConditionalAccessPolicy AllowLimitedAccess 
  -AllowExternalRecipients $true
  -RequireSignIn $false
5. Azure AD B2B Settings
powershell
New-AzureADPolicy -Definition @(‘{’B2BManagementPolicy‘:{’InvitationsAllowed‘:true}}’) 
  -DisplayName ‘AllowExternalSigners’ 
  -Type ‘B2BManagementPolicy’
6. Enterprise Deployment Scenarios
Create a dedicated external signers group
powershell
New-UnifiedGroup -DisplayName ‘External Signers’ -AccessType Public 
  -AccessType Public 
  -AutoSubscribeNewMembers $true
7. Power Automate process transformation
yaml
actions.
  - type: ‘RequestSignature’
    inputs: -AutoSubscribeNewMembers $true
      recipients: ‘${triggerBody(’external_email‘]}’) 
        - email: ‘${triggerBody()[’external_email‘]}’
      authenticationType: ‘None’
8. Compliance Configuration
powershell
Set-IRMConfiguration -ExternalSignatureTypes @(‘All’)
9. Check the external share status:
powershell
Get-SPOSite <SiteURL> | fl SharingCapability, ConditionalAccessPolicy
10. Verify the organisation relationship:
powershell
Get-OrganisationRelationship | where {$_.DomainNames -like ‘*external.com*’}
11. Audit log analysis:
powershell
Search-UnifiedAuditLog -RecordType SharePointSharingOperation