diff --git a/.changeset/solana-device-signer-error.md b/.changeset/solana-device-signer-error.md
new file mode 100644
index 000000000..fe0833a0b
--- /dev/null
+++ b/.changeset/solana-device-signer-error.md
@@ -0,0 +1,5 @@
+---
+"@crossmint/wallets-sdk": patch
+---
+
+Reject device signers for Solana wallets with a clear error message instead of letting the request fail with a 500. Includes a contact sales link for access.
diff --git a/packages/wallets/src/wallets/wallet-factory.ts b/packages/wallets/src/wallets/wallet-factory.ts
index 73fdcb096..7241ccc7f 100644
--- a/packages/wallets/src/wallets/wallet-factory.ts
+++ b/packages/wallets/src/wallets/wallet-factory.ts
@@ -11,7 +11,7 @@ import type {
     Signer as SignerResponse,
     RegisterSignerParams,
 } from "../api";
-import { WalletCreationError, WalletNotAvailableError } from "../utils/errors";
+import { InvalidSignerError, WalletCreationError, WalletNotAvailableError } from "../utils/errors";
 import { type Chain, validateChainForEnvironment } from "../chains/chains";
 import type { ExternalWalletRegistrationConfig, PasskeySignerConfig, SignerConfigForChain } from "../signers/types";
 import { Wallet } from "./wallet";
@@ -400,6 +400,12 @@ export class WalletFactory {
                         return { signer };
                     }
                     if (signer.type === "device") {
+                        // Device signers are not supported for Solana wallets
+                        if (chain === "solana") {
+                            throw new InvalidSignerError(
+                                "Device signers are not currently supported for Solana wallets. Contact sales (https://www.crossmint.com/contact/sales) for access."
+                            );
+                        }
                         // If the device signer already has a locator or public key (e.g., created via createDeviceSigner helper), use it directly
                         if (signer.publicKey != null) {
                             return {
diff --git a/packages/wallets/src/wallets/wallet.ts b/packages/wallets/src/wallets/wallet.ts
index 9f0471b6b..bf5dfab91 100644
--- a/packages/wallets/src/wallets/wallet.ts
+++ b/packages/wallets/src/wallets/wallet.ts
@@ -618,6 +618,13 @@ export class Wallet<C extends Chain> {
     ): Promise<T extends PrepareOnly<true> ? AddSignerReturnType<C> : WalletSigner> {
         walletsLogger.info("wallet.addSigner.start");
 
+        // Device signers are not supported for Solana wallets
+        if (signer.type === "device" && this.chain === "solana") {
+            throw new InvalidSignerError(
+                "Device signers are not currently supported for Solana wallets. Contact sales (https://www.crossmint.com/contact/sales) for access."
+            );
+        }
+
         // Resolve server signer config to locator string
         const resolvedSigner =
             typeof signer === "object" && "type" in signer && signer.type === "server"