Why doesn’t my feed update?

Hi,

I recently set up a WordPress blog, and set up an account on feedburner to monitor the traffic.

Here’s my blog:
https://blog.trossenrobotics.com/

Here’s my feed:
https://feeds.feedburner.com/TrossenRoboticsBlog

For some reason, Yahoo! doesn’t seem to update like it should. I tried to ping Yahoo!, but it won’t let me. I used the following URL:

https://api.my.yahoo.com/rss/ping?u=https://feeds.feedburner.com/TrossenRoboticsBlog

and this is the error I get:
Refresh failed. Feed not found:

https://feeds.feedburner.com/TrossenRoboticsBlog

I ran it through a validator:

https://validator.w3.org/feed/check.cgi?url=http%3A%2F%2Ffeeds.feedburner.com%2FTrossenRoboticsBlog

and the feed is valid, but I’m getting warnings that the feed may cause some problems because I have a few tags/attributes that apparently I shouldn’t. I don’t know how to correct this, because these tags are so that I can put YouTube videos in my posts.

I’m really new to bloggin, so if anyone notices something that I have done/am doing wrong (even unrelated to this topic), please feel free to mention it here:)

Any help would be greatly appreciated:)