Merge pull request #194208 from stegag/patch-24

Update vpn-gateway-vpn-faq.md

Author: PRMerger10

articles/vpn-gateway/vpn-gateway-vpn-faq.md

@@ -215,7 +215,7 @@ Transit traffic via Azure VPN gateway is possible using the classic deployment m
 
 ### Does Azure generate the same IPsec/IKE pre-shared key for all my VPN connections for the same virtual network?
 
-No, Azure by default generates different pre-shared keys for different VPN connections. However, you can use the Set VPN Gateway Key REST API or PowerShell cmdlet to set the key value you prefer. The key MUST be printable ASCII characters.
+No, Azure by default generates different pre-shared keys for different VPN connections. However, you can use the Set VPN Gateway Key REST API or PowerShell cmdlet to set the key value you prefer. The key MUST only contain printable ASCII characters except space, hyphen (-) or tilde (~).
 
 ### Do I get more bandwidth with more Site-to-Site VPNs than for a single virtual network?