Sometimes older posts get archived if the mods reply to the post and then mark it as solved.
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It appears you wrote two separate posts on the same subject. The moderators may have archived the content as duplicate postings. Sometimes things get removed if they feel the post should more appropriately be an error report, or it hung around too long with no responses. Sometimes, they just feel like it. You would have to private message a moderator to ask why - maybe you'll be lucky and actually get an answer.
I have not seen any other posts on this matter. I, myself, am having no problem with Samsung Browser, even though I rarely use it in favor of Edge. When I do use it, I am not blocked from any sites. They recently did have an update to the app, so maybe the issue was fixed? Or, maybe what's happening is a result of something else on your phone interfering. It should be noted that not only do I use an ad blocker in Samsung Browser, but also an anti malware guard and an alternate dns server. None of this blocks access to any legitimate site.
The severely outdated chromium engine of Samsung internet for android has been reported several times. This was causing numerous websites to restrict or block access with messages such as: 'Your browser is out of date, please upgrade to a modern, fully supported web browser.'
Have you tried posting a comment on Facebook using Samsung internet for android?
The latest release for windows and the beta for android are at version 30, and had their chromium engines finally updated. That's good news.
However, the regular android Samsung internet is still at version 29 with the outdated engine.
