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DENVER (KDVR) — Walmart and Sam’s Club will begin distributing the COVID-19 vaccine by appointment online at various pharmacy locations around Colorado on Friday.

Those who are currently eligible to receive the vaccine in Colorado, people over the age of 65 and educators, can make an appointment online.

Appointments can be made through Walmart’s website and Sam’s Club website. If you’re struggling to find an appointment, continue checking online. You do not need to be a Sam’s Club member to register for a vaccine.

As of Wednesday morning, Walmart announced it was dealing with technical difficulties on the appointment website due to a surge in interest.

“The Walmart scheduling system is currently experiencing technical difficulties following a surge of appointments. Our team is currently working to resolve the matter to have the scheduler back online as soon as possible.”

Walmart and Sam’s Club focused on stocking vaccines in their pharmacies in underserved communities.

Walmart worked with the CDC and studied population density, customer demographics, infection rates and availability of local healthcare sources to determine locations. Walmart and Sam’s Club will expand to other locations as it receives more allotments of the vaccine.

Lee Proc tried to get her 69-year-old husband scheduled for a vaccine appointment at a Colorado Walmart and couldn’t.

“It’s very frustrating,” she said. “Everything just kept saying ‘No appointments available.'”

Walmart says there were problems with the site when so many people tried to register.

“We had some technical issues with our site. Walmart is actively working on that, of course, to get that up and running as soon as possible,” said Rilie Mueller, the pharmacy clinical services manager.

When the problem is fixed and appointments are available, Coloradans who are eligible for the vaccine should be able to schedule a vaccine appointment through the Walmart and Sam’s club websites.

“We are probably going to start this week with over 5,000 doses,” Mueller said, adding, “The spots are being put in there based on how much we are being allocated at this time. More spots and more locations will open as soon as we get them.”

Here is a list of Walmart and Sam’s Club pharmacy locations that will begin distributing the vaccine Friday: