No. That is "witać".
- Witamy w naszym domu! (Welcome to our house!)
We sometimes use the form of the 2nd person future tense. It's a bit like "we welcome" changing to "you are welcome"? That's not exactly that, but similar. Anyway, instead of "witamy" we can say "witajcie", with 2nd person plural future.
I have found in these exercises there is a grey line between the use of verb + dative as opposed to verb + accusative. Given the invitation is for someone, I could have easily expected the use of "wam" as opposed to "was". Are there any hard and fast rules for determining whether dative is used as opposed to accusative?