How about if you have a living spouse, get annulled and then receive communion
If you’re divorced but not remarried, that’s not a problem for the Catholic church.
The way you put it is a little confusing.
"Annulment" means there has been an investigaiton and a finding by a tribunal that you were not, sacramentally, spouses to begin with. If the first marriage was "null" (meaning it was not a sacramental marriage) then the "ex" was not and is not your spouse in a sacramental sense. There was someting defective from the git-go.
Therefore--- assuming you're in a state of grace --- there is no impediemnt to Holy Communion.
Annulments allow for communion, because annulment declares that no licit marriage took place to begin with.
Even if your marriage has not been annulled, if you are divorced not remarried there is no bar to receiving Communion.
Annulment is one of those slick, back alley deals that are OK, as long as Rome get appropriately compensated.