Virginia holds its primaries (for office other than president) in June. Candidates for U.S. Senate needed 3,500 signatures. The law says they need 10,000, but a state court had lowered that last month to 3,500. Even though the new requirement was considerably easier than the legal requirement, and even though candidates could have been petitioning since January (before the lockdown), only three candidates had at least 3,500 valid signatures.

See this story. The candidate who filed the lawsuit that resulted in a lower requirement, Omari Faulkner, did not get on the ballot, because he had only submitted 3,769. Thanks to D.C. Sachs for the link. The story does not say how many valid signatures Faulkner had. Perhaps he would have qualified if he had asked the court to set the requirement at 3,000, instead of 3,500. Six Republicans had been trying to get on the ballot.