504 Gateway Time-out on the iframe

[NicoCaldo]

I have a music blog and I usually features the record from Spotify with the usually embedded code but now, this happens

https://prnt.sc/iqp2ue

When I post it in my editor  or the post it's all good https://prnt.sc/iqp3ya

[NicoCaldo]

I have now noticed that all the old iframe doesn't work. I have just published a new article with the ode just copied a minute ago and it works...