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-Prevents @*.local email addresses from ever syncing to TeamViewer, even if mail or legacy attributes are misconfigured -Fixes incorrect reliance on the mail attribute in non-Exchange on-prem AD environments where it is empty or wrong -Ensures UPN (userPrincipalName) is treated as authoritative when it contains a valid external domain -Stops TeamViewer from auto-creating accounts with non-routable internal domains -Preserves existing group membership search logic (recursive/non-recursive behavior unchanged). -Properly parses SMTP entries in proxyAddresses without assuming Exchange schema usage -Eliminates silent fallbacks that previously defaulted to user@domain.local -Adds a hard guard rail so invalid internal domains cannot reappear via future schema changes or bad data. -Supports mixed environments (some users with UPN only, some with legacy attributes) -Adds an operator-controlled fallback to construct samAccountName@externaldomain when no valid external address exists. -Ensures the fallback decision is prompted once per run, avoiding repetitive prompts -Prevents duplicate or conflicting emails by deduplicating candidate values -Keeps TeamViewer account matching stable by supplying consistent, externally valid identifiers -Avoids any dependency on Exchange, Entra ID Connect, or O365 schema extensions
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-Prevents @*.local email addresses from ever syncing to TeamViewer, even if mail or legacy attributes are misconfigured
-Fixes incorrect reliance on the mail attribute in non-Exchange on-prem AD environments where it is empty or wrong
-Ensures UPN (userPrincipalName) is treated as authoritative when it contains a valid external domain
-Stops TeamViewer from auto-creating accounts with non-routable internal domains
-Preserves existing group membership search logic (recursive/non-recursive behavior unchanged). -Properly parses SMTP entries in proxyAddresses without assuming Exchange schema usage
-Eliminates silent fallbacks that previously defaulted to user@domain.local
-Adds a hard guard rail so invalid internal domains cannot reappear via future schema changes or bad data.
-Supports mixed environments (some users with UPN only, some with legacy attributes)
-Adds an operator-controlled fallback to construct samAccountName@externaldomain when no valid external address exists.
-Ensures the fallback decision is prompted once per run, avoiding repetitive prompts
-Prevents duplicate or conflicting emails by deduplicating candidate values
-Keeps TeamViewer account matching stable by supplying consistent, externally valid identifiers
-Avoids any dependency on Exchange, Entra ID Connect, or O365 schema extensions