HTTP/2 with Argo/Load Balancer

[fsf.it]

Hi,

Is HTTP/2 supported with Argo/Load Balancer?

I have origin connected over Argo tunnel with Load Balancer and cannot get HTTP/2 to work.

[sdayman]

HTTP/2 at which end? Visitors should be seeing HTTP/2, but Cloudflare doesn’t use HTTP/2 to connect to origin servers (last I checked).

[fsf.it]

HTTP/2 between browser and Cloudflare proxy server.

There is happening something strange. I have tested it on 2 PCs and on one it is working fine and on other it does not. On both the same browser but they are in different networks and with different Windows versions.

PC 1:
Chrome 75.0.3770.100 stable x64
Windows 10 Home x64 1903 build 18362.175

cdn-cgi/trace:
fl=79f21
h=removed
ip=removed
ts=1562171127.6
visit_scheme=https
uag=Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36
colo=HEL
http=http/1.1
loc=FI
tls=TLSv1.2
sni=plaintext
warp=off

PC 2:
Chrome 75.0.3770.100 stable x64
Windows 10 Enterprise x64 1809 build 17763.557

cdn-cgi/trace
fl=79f13
h=removed
ip=removed
ts=1562224898.895
visit_scheme=https
uag=Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36
colo=HEL
http=http/2
loc=FI
tls=TLSv1.3
sni=plaintext
warp=off

Am I missing something?

[fsf.it]

I found the reason and how to fix it: Http/2 is available, but not used. Please help!