Hi all,
I am using Moodle 3.3.4 (Build: 20180115) with in-house installed, trying to use SAML2 login.
All setting as images below:
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4. in config.php
Seem like all ok but still cannot use single signed on feature, what else I have to check?
I don't know but you're using a version of Moodle that's been completely out of support for two-and-a-half years 
Thanks for your help, can I upgrade 3.3.4 jump to 3.11 directly (php version = 7.1.33)
https://docs.moodle.org/311/en/Upgrading#Check_the_requirements. Each release has a similar link - just replace /311/ with whatever you want. I maintain an overview table here http://www.syndrega.ch/blog/#php-and-dbms-compatibility-of-major-moodle-releases.
Thanks Visvanath, just would like to know, my moodle V.3.3.4 is good enough for SAML2 installation or not? Thanks once again.☺
I don't know the SAML2 Single sign on plug-in https://moodle.org/plugins/auth_saml2. According to its versions page https://moodle.org/plugins/auth_saml2/versions the plug-in is (was) available since Moodle rel. 2.7 up to the latest 3.11.
I was answering your question "can I upgrade 3.3.4 jump to 3.11 directly (php version = 7.1.33)".
I was answering your question "can I upgrade 3.3.4 jump to 3.11 directly (php version = 7.1.33)".