I have got a bit fed up of waiting for partners to reply so are setting up Marketing Cloud by myself (Yay!). Anyway it was all going really well, we have had the domain configured, followed a few Trailheads and I was setting up marketing cloud connect into our Service Cloud instance. It all went swimmingly.
I got to the end of the trailhead and sent the test email to a new lead I created. It took about an hour but the send failed without any message (sent from Service Cloud instance accessing Marketing Cloud that way). I sent it again after I was 100% sure the domain was set correctly (now verified from address) and I receive the error:
Error queuing send.
I have checked the MC configuration from the trailhead and everything appears to be correct. A quick google showed me this article , I also looked into the Data Extension that was created for the lead report in Email Studio and it shows no records.
Workflow appears to be activated and synching but naturally I am a beginner with all of this. Just want to get it right and not go undoing a lot of stuff as it maybe something obvious/silly. Yes I have contacted a freelancers with experience to see if someone can help short term too :(
This appears to offer some advice maybe not included in the Trailhead, will go through this now: https://help.salesforce.com/articleView?id=mc_co_connect_the_clouds.htm&type=5