Global Unicast IPv6 address problem

enero99

Hello,
I have the following problem.
My Bananapi Pro with bananian (3.4.108) has a Global Unicast IPv6 address (2001: xxxx: xxxx: xxxx: yyyy yyyy yyyy yyyy / 64 Scope Global Dynamic). The Bananapi Pro was been reinstalled.
Unfortunately, the Global Unicast IPv6 address from my Bananapi Pro NOT appears in my router.
And the router can not forward requests to that address.

My NUC DN2820FYKH with standard Debian also has a Global Unicast IPv6 address. However, this appears in my router. And the router can forward requests to that address.

What should I do that the Bananapi Pro Global Unicast IPv6 address is available on the router?

greeting
enero99