@androidgalaxy 

Hi,

Your "Endpoint" IP address of 100.87.69.50 is not a public IP address. The address range 100.64.0.0 - 100.127.255.255 is being used by Internet Service Providers for CG-NAT.

These IP addresses are not routed through the Internet, hence your WireGuard client cannot make a handshake with your BE550 router.

If you need to make this work, then your only chance is to contact your ISP and ask them to assign a public IP address to your BE550.
 

  @woozle 

hello mate, I have subscribed with DDNS   Even I try with that configuration I can't make any connection with WG server. But if we you use DDNS will that solve the public address issue .isn't it?

  @androidgalaxy 

Please check the "Internet IP Address" of your BE550.

If it is within 

100.64.0.0 - 100.127.255.255

or 10.0.0.0 - 10.255.255.255
or 172.16.0.0 - 172.31.255.255
or 192.168.0.0 - 192.168.255.255
then you cannot reach the BE550 via IPv4 from the Internet. 

  @woozle 

hello mate, I agre with your point. But I am using DDNS , that will help dynamic up changes . I am not an expert, but from research , I can see many of them don't have the staic Ip or public ip, they all solved by DDNS . I am using the same approach. Many of them don't have staic or public ip and still they able to achieve the expected  results.

earlier I used BT Internet they have used PPOE , it's worked well, even they don't gave me public ip. Now I move to you fibre, they are using DHCP, after that I am started facing issue 

  @androidgalaxy 

The issue is not related to PPPoE or DHCP.

If your VPN server worked well with BT, then they must have given you a public IP address. It couldn't have worked without.

The DDNS service queries your Internet connection from the Internet side, hence it sees a public IP address, like the one you show (88.97....).

However, this 88.97.... IP address will be used by YouFibre for many of their customers at the same time. If you try to connect to that 88.97.... address, then YouFibre won't know who you are trying to reach and they will just ignore it.